fix: Default value to 0.0F instead of null

Co2SensorService/src/main/java/fr/insa/arm/Co2SensorService/controller/Co2SensorController.java

@@ -29,7 +29,7 @@ public class Co2SensorController {
 
     @PostMapping("/")
     public int addSensor() {
-        sensorValues.put(currentMaxId, null);
+        sensorValues.put(currentMaxId, 0.0F);
         return currentMaxId++;
     }
 

GazSensorService/src/main/java/fr/insa/arm/GazSensorService/controller/GazSensorController.java

@@ -29,7 +29,7 @@ public class GazSensorController {
 
     @PostMapping("/")
     public int addSensor() {
-        sensorValues.put(currentMaxId, null);
+        sensorValues.put(currentMaxId, 0.0F);
         return currentMaxId++;
     }
 

LightSensorService/src/main/java/fr/insa/arm/LightSensorService/controller/LightSensorController.java

@@ -29,7 +29,7 @@ public class LightSensorController {
 
     @PostMapping("/")
     public int addSensor() {
-        sensorValues.put(currentMaxId, null);
+        sensorValues.put(currentMaxId, 0.0F);
         return currentMaxId++;
     }
 

TemperatureSensorService/src/main/java/fr/insa/arm/TemperatureSensorService/controller/TemperatureSensorController.java

@@ -29,7 +29,7 @@ public class TemperatureSensorController {
 
     @PostMapping("/")
     public int addSensor() {
-        sensorValues.put(currentMaxId, null);
+        sensorValues.put(currentMaxId, 0.0F);
         return currentMaxId++;
     }